Historical clue formulations

• "Catch ya in the morn!" — 2026-09-20
• When doubled, "Sleep well" — 2025-07-27
• "What hath ___ to do with sleep?": Milton — 2023-12-31
• Dark time — 2022-07-12
• "Sweet dreams!" — 2022-07-10
• When repeated, call to someone going to bed — 2022-01-14
• When to stargaze — 2021-07-26
• It never occurs above the Arctic Circle during the summer solstice — 2021-04-18
• Prime-time time — 2019-02-06
• "Sweet dreams" — 2017-10-13
• With 9-Down, hit sitcom of the 1980s-'90s — 2017-03-18
• When one sees stars — 2016-03-28
• Busy time for bats — 2015-05-27
• Word that can precede either part of 17-, 25-, 38-, 54- and 63-Across — 2015-03-24
• Like all World Series games, now — 2014-09-10
• Popular Christmas carol — 2014-07-10
• Time for vampires — 2013-11-06
• Brief remark upon retiring — 2013-09-08
• See 26-Across — 2013-01-26
• Dark hours — 2012-06-28
• Comment to one who's retiring, informally — 2012-05-09
• Dracula's time — 2011-05-25
• Dusk to dawn — 2006-10-04
• Darkness — 2004-02-29
• Bedtime call, informally — 2003-09-18
• When most people retire — 2003-01-12
• Time for some shifts — 2001-10-30
• Dusk to dawn — 1997-11-18
• "S'long" — 1995-12-29